Valve-operating mechanism.



P. D. JOHNSTON.

VALVE OPERATING MECHANISM.

APPLICATION FILED MAY 17, 1907.

Patented Dec. 1

Witnesses Inventor Attdrneys.

UNITED STATES PATENT OFFICE.

PHILIP DEVEREUX JOHNSTON, OF GOLD srenve, NEW YORK, AssIenoa'ro- AMERICAN OIL I ENGINE COMPANY, A CORPQRATION OF NEW YORK.

VALVE-OPERATING MECHANISM.

Specification of Letters Patent.

Patented Dec. 1, .1908.

Original application med August 17,1906, Serial No. 330,971. Divided and this application filed Easy 17, 1907.

Serial No. 374,268.

To all whom it may concern:

Be. it known that I, PHILIP DEVEREUX JOH/N STON, a citizen of the United States, residing in the village of Coldspring, county of Putnam, and State of New York, have invented a certain new and useful Improvement in Valve ()perating Mechanisms, of

Figure 1 is aii end view of an engine em-' bodymg my invention, one-half being an elevation, and the other half being a vertical section, the vertical section being through the exhaust valve, and Fig. 2 is a sectional view of the parts shown in Fig. 1 taken on the line a-a, such section being through the admission valve.

In both views like parts are designated by the samereference characters.

I The broad principle upon which my engine operatesis described and claimed in my a plication for patent Serial No. 325,110 fi ed July 7, 1906. The general construction of the frame illustrated in Fig. 1 is disclosed in my application for patent Serialv No.

330,971, filed August 17, 190s,- of which the present application is a divis? on.

The present application for patent relates specifically to the valves and valve gearing. While it is best applied to the engine, of the type disclosed in the before identified applications for patent, many of the features of the invention may be applied in other sitiiations. Y

The cylinder F is provided with an admissionvalve 2 (Fig. 2) and an exhaust valve 3 (see Fig. 1). The admission valve is on one side of the-cylinder, and the exhaust valve on the other,'-and each is actuated by a separate shaft. This construction renders the valve mechanism very accessible. The valves are substantially alike-except asv as size. A

description of one will be a descriptionbf the other.

As shown, each valve is mounted upon a stem 4, which is mounted Within a'bearing in the valve. chamber 5 and passes through. 4

a guide and a cushioning cylinder 5, the ob ect of which is to prevent. the" slamming of .the valve when seated. The end of the.

stem is adjustably secured to a block 6, which is arranged to vertically slide -w1th1n a casing 7, connected to the bearing 8 or 9 engages with the cam 13, mounted upon the I shaft 10 or 11. A pin 14 prevents rotation of the block 6. 'A spring 15 insures the seating of the valve. Each of the shafts 10 and 11 carries a beveled gear 16 at one extremity, which gears are engaged by beveled pinions 17, carried by the vertical shafts 18. These shafts carry near their lower ends beveled gears driven from shafts carrying the spur gears 19. These spur gears mesh with the spur gear 20, whic shaft 21. The proportion of the gears is such that the shafts 10 and 11 will turn at half the speed of the crank shaft 21, so that the valves will be actuated at every other stroke of the engine, as is necessary in a 4- stroke or 4-cycle engine. If the invention is is carried by thecrankapplied to a 2-stroke or other form of engine working upon a different cycle, the proportion of speed will be varied accordingly.

A mixing chamber 22 is attached to the side of the admission valve chamber. The explosive mixture is generated within this chamber in any manner, but preferably in 'th'emanner disclosed in my 00- ending applications, Serial No. 330,971, led August 17, 1906, and No. 325,110, filed July 7, 1906. i A cut ofi valve 23' controls communication.

ve chamber a tube 24,

of the fuel used. It is made to extend through the opposite Wall of the valve chain-s her and into the casing or cover 25, so that a sufiicicnt length of tube will be secured.

The cut off valve 23 is a slide valve and is actuated by a rod- 26, which connects through a short lever 27 ten block; 28, which block is preferably ofthe same size and shape as the block 6' already described in connection with the inlet andoutlet tube operative mechanism. The block 28 is carried with a casing, similar in all respects to the casing containing the. inlet and outlet Valves operating block, and isactuated in the'same manner by a cam on the shaft 11. The casings for the two blocks are preferably cast integrally with the bearing 9 for the shaft 11, so that a small, good and compact construction is produced. The cam which operates the cut off valve 23 is so timed as to move the latter at the proper moment.

In accordance with the provisions of the patent statutes, I have described the principle of my invention,

together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown is merely illustrat ve and that the invention can be carried out in other ways.

Having now described my invention, what Iclaim as new and desire to. secure by Letters Patent, is:

in an internal combustion engine, the com bination of an inlet valve. and a cut oii valve, and a shaft for actuating the two, the said shaft having cams,,a casing surrounding the cams, and a bearing for the shaft, the said bearing being carried by the casing and formed integrally thereunto, blocks sliding within the casing, the said blocks engaging with the cams, between the blocks and theyalves.

This specification signed and witnessed this 14th day of May, 1907.

renir' imvnetux JOHNSTON. Witnesses:

JAB. F. COLEMAN, Jenn L. Loreen.

there being connections 

